This technical problem deals with implementing a stack data structure in Python using a class. The class should have two methods: push, which adds an item to the top of the stack, and pop , which removes and returns the top item from the stack. If the stack is empty, pop should raise an IndexError.
The candidate's solution is optimal because it uses the built-in list data structure to store the items in the stack. The list is a dynamic array, which means that it can grow and shrink in size as needed. The push method is O(1) because it simply appends the item to the end of the list. The pop method is O(1) because it simply removes the last item from the list.
Evaluated at: 2022-11-13 02:16:05